Sewing machine



O. R. HASS Feb. 21, 1939.

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5. h m w/r a i m mwgs 7Y5. WQZTM' Patented Feb. 21, 1939 UNITED STATES PATENT OFFICE SEWING MACHINE Application April 29, 1936, Serial No. 76,324

27 Claims.

The present invention relates to shoe sewing machines, and is intended primarily as an improvement in wax thread lockstitch sewing machines of the type adapted to stitch the outsole to the Welted upper and insole of a shoe. Certain features of the invention, however, may be used to advantage in connection with chain stitch sewing machines or with sewing machines other than outsole stitchers.

The objects of the invention are to simplify and improve the construction and mode of operation of a wax thread sewing machine and to render it more efficient as compared to other sewing machines of the type referred to, when sewing at high speeds, or to permit more accurate control of operations than in machines heretofore in common use.

The several features of the invention are herein illustrated as embodied in a curved hook needle lockstitch shoe sewing machine in which the stitch forming devices are similiar in many respects to those disclosed in U. S. Letters Patent No.

2,031,479 of February 18, 1936, and No. 2,045,643

of June 30, 1936, both in the name of the present inventor. In the machine of these patents, before the needle and locking threads are interlocked in forming each stitch, a length of 1ocking thread is drawn off in a measured amount from a supply contained within the locking 30" thread case of the machine. To prevent further withdrawal of locking thread from the thread case and to set the stitch, a uniform distance within the work, there is provided a thread lock on the thread case arranged to grip the thread 351 as each stitch is being set and to release the thread while the measured amount is being withdrawn. To insure that each measured amount of thread and no more shall be withdrawn from the thread case, it is desirable that the thread lock be operated to retain a grip on the thread as long as possible between the time the thread is withdrawn and the time the measured thread is used. However, due to the necessity of passing the needle thread loops freely about the 45 thread case and due to required limitations in timing, there are certain practical difficulties in so operating any lock or other thread gripper provided on the thread case. In the machines of the patents referred to, the thread lock on the thread case is actuated directly by the rotary loop taker which passes the loops of needle thread about the thread case to interlock the threads, but such an arrangement is objectionable, particularly 55 when the loop taker is rotated continuously a number of times in each sewing cycle as is usual practice in a high speed machine.

One feature of the present invention, therefore, contemplates the provision in a lockstitch sewing machine having a thread lock on the thread case, of a lock actuating memberarranged for movement relatively to the loop taker so as not to be limited in its operation by either the looping movements of the loop taker or the passage of the needle loop about the thread case. In applicants prior machines, the thread case is held from rotation within the loop taker by suitably cooperating devices and, in the machine hereinafter described, the member for actuating the thread lock is mounted on the means for supporting said devices and is arranged for movement towards and from the thread case in proper relation with the movement of the needle loop about the thread case to avoid obstructing the passage of the needle loop between the lock actuating member and the thread lock during each stitching cycle.

Other features of the invention contemplate new and improved thread locking and tensioning devices mounted on the locking thread case, a new and improved looper actuating mechanism, and new and improved constructions and arrangements for actuating and controlling certain of the operating parts of the machine both while the machine is running and when it is stopped at the completion of a seam.

These and other features of the invention including certain novel and improved constructions and arrangements of parts are hereinafter described in the following detailed specification, and more particularly pointed out in the appended claims.

In the drawings, Figure 1 is a View in side elevation looking from the right of a lockstitch shoe sewing machine embodying the features of the present invention; Figure 2 is a view in front elevation on an enlarged scale of the sewing head of the machine; Figure 3 is a View in side elevation, taken from the right, on a further enlarged scale of the sewing head; Figure 4 is a plan view of the head with the enclosing covers removed, parts having been broken away; Figure 5 is aview in rear elevation of the sewing head broken away, and shown partly in section; Figure 6 is a plan view of a portion of the sewing head on a still further enlarged scale with certain parts broken away to illustrate the operating mechanism; Figure 7 is a sectional plan view of a portion of the sewing head with the enclosing covers removed; Figure 8 is a sectional side 

